The ISL88731 is a highly integrated Lithium-ion battery charger

controller, programmable over the SMBus system management

bus (SMBus). The ISL88731 is intended to be used in a smart

battery charger (SBC) within a smart battery system (SBS) that

throttles the charge power such that the current from the

AC-adapter is automatically limited. High efficiency is achieved

with a DC/DC synchronous-rectifier buck converter, equipped

with diode emulation for enhanced light load efficiency and

system bus boosting prevention. The ISL88731 charges one to

four Lithium-ion series cells, and delivers up to 8A charge

current. Integrated MOSFET drivers and bootstrap diode result

in fewer components and smaller implementation area. Low

offset current-sense amplifiers provide high accuracy with

10mΩ sense resistors. The ISL88731 provides 0.5

end-of-charge battery voltage accuracy.

The ISL88731 provides a digital output that indicates the

presence of the AC adapter as well as an analog output which

indicates the adapter current within 4 accuracy.

The ISL88731 is available in a small 5mmx5mm 28 Ld Thin

(0.8mm) QFN package. An evaluation kit is available to reduce

design time. The ISL88731 is available in Pb-Free packages.

特性 Features

? 0.5 Battery Voltage Accuracy

? 3 Adapter Current Limit Accuracy

? 3 Charge Current Accuracy

? SMBus 2-Wire Serial Interface

? Battery Short Circuit Protection

? Fast Response for Pulse-Charging

? Fast System-Load Transient Response

? Monitor Outputs

- Adapter Current (3 Accuracy)

- AC-Adapter Detection

? 11-Bit Battery Voltage Setting

? 6 Bit Charge Current/Adapter Current Setting

? 8A Maximum Battery Charger Current

? 11A Maximum Adapter Current

? +8V to +28V Adapter Voltage Range

? Pb-Free (RoHS Compliant)

Applications

? Notebook Computers

? Tablet PCs

? Portable Equipment with Rechargeable Batteries